<?php
    define('DB_HOST','localhost');
    define('DB_USER','root');
    define('DB_PASS','');
    define('DB_NAME','review_app');

    $conn=new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);
    if($conn->connect_error){
        die("连接失败" . $conn->connect_error);
    }

    echo "连接成功";
    // 完成
?>